Whoopi Goldberg addresses the development of Sister Act 3 after Maggie Smith’s passing. Smith, who played the Reverend Mother in the previous Sister Act movies, passed away on September 27 at the age of 89. Sister Act 3‘s cast was never confirmed beyond Goldberg returning to reprise her role as Deloris Van Cartier/Sister Mary Clarence, although it was hoped that Smith, Kathy Najimy, and other actors from the prior movies would return for the long-awaited sequel.

https://screenrant.com/sister-act-3-update-whoopi-goldberg-maggie-smith-death/